package work.day07work;

public class Test05 {
    public static void main(String[] args) {
        Thread t1 = new Thread() {
            @Override
            public void run() {
                Foo.dosome();
            }
        };
        Thread t2 = new Thread() {
            @Override
            public void run() {
                Foo.dosome();
            }
        };
        t1.start();
        t2.start();
    }
}

class Foo{
    public static void dosome(){
        synchronized (Foo.class){
            System.out.println("hello");
        }
    }
}